Design: Cluster randomized trial; data collected in 2010-2011; analyzed in 2011-2012
Setting/Participants: Individuals (seeds) recruited in multiple settings (online, via newspaper ads and face-to-face) who were asked to recruit up to three friends, who in turn recruited additional friends, extending three waves from the seed. Seeds and waves of friends were considered networks and exposed to either intervention or control condition.
Intervention: Exposure to Just/Us, a Facebook page...